Product Summary:
The EG4 314Ah Indoor Battery + EG4 FlexBOSS21 ESS System delivers smart power, simple reliability, and scalable energy independence for both on-grid and off-grid applications. Combining the high-capacity 16kWh EG4 WallMount Indoor LiFePO₄ battery with the advanced FlexBOSS21 hybrid inverter, this system provides dependable whole-home backup and efficient energy management in a clean, space-saving design.
The FlexBOSS21 delivers 12kW output and up to 21,000W PV input with 3 MPPTs, maximizing solar production and system flexibility. Paired with the EG4 314Ah battery – featuring 200A continuous output, 8,000+ cycle life, and third-generation BMS technology – this system ensures stable, high-performance energy delivery for residential and small commercial use.
Designed with UL 9540 certified configurations, advanced battery management, and U.S.-engineered components, this system ensures safe, maintenance-free performance with seamless closed-loop communication between battery and inverter.
Ships From: Texas, USA
Warranty: 10 Years (Battery), 10 Years (Inverter)
Support: Lifetime USA-Based Tech Support
Compatibility
Integrated & Optimized System:
- EG4 314Ah Indoor Battery + EG4 FlexBOSS21 Hybrid Inverter
Expandable & Flexible:
- Cross-compatible with other EG4 battery systems
- Scalable energy storage for growing system needs
- Supports grid-tied, hybrid, and off-grid installations
Key Features
- Complete ESS Solution – Battery + inverter system designed to work seamlessly together
- 21,000W PV Input / 12kW Output – High-capacity power for residential and commercial systems
- 16kWh LiFePO₄ Battery (314Ah) – High-density, safe lithium storage
- 200A Continuous Output / 12.8kW Peak – Powers heavy household loads and backup systems
- 8,000+ Cycle Life – Long-lasting performance at 80% DoD
- Advanced 3rd-Gen BMS – Improved monitoring, faster response, and precise balancing
- Auto-ID Technology – Simplifies installation and system configuration
- Self-Heating Function – Reliable performance in cold climates
- Closed-Loop Communication – Seamless coordination between battery and inverter
- GridBOSS Integration – Advanced load management, AC coupling, and generator support
- Wall or Floor Mount Design (IP20) – Flexible, space-saving indoor installation
- Maintenance-Free Operation – No routine servicing required
A high-capacity, intelligent energy storage system built for performance, flexibility, and long-term energy independence – with the reliability and control modern energy systems demand.
EG4-WallMount Indoor Battery ESS | 48V 314Ah | 16kWh | UL9540 | EG4 FlexBOSS21 Hybrid Inverter
YOU SAVED: $600.00
SKU# K0210
Battery Selected
1× EG4 314Ah Indoor
Total Capacity
16 kWh
Inverter Selected
1× EG4 FlexBOSS21
Input / Output
21 kW / 16 kW
Choose Your ESS Configuration*
1x Inverter
Standard
2x Inverter
Large
3x Inverter
3 Phase
Introducing The EG4 WallMount Indoor Battery
Latest BMS Technology
Third-Generation BMS: Provides advanced monitoring, improved balancing precision, and faster response times for greater safety and system efficiency.
All-Weather Self-Heating
Self-Heating Function: Maintains optimal performance and battery health in cold environments.
Your Personal Power House
200A Continuous Output / 12.8kW Peak Power: Supports heavy household loads and seamless backup operation.
Show off your build!
Community sparks inspiration, if you’d like to take pride in presenting your set up, submit your build to us for a chance to be featured and win a BigBattery mystery gift. Enter your build here.
Key Features:
- Cross-Compatible with Other EG4 Models: Seamlessly integrates with existing
EG4 battery systems for flexible scaling and expanded storage capacity. (Note: UL9540 Certified only with Flexboss 18 & Flexboss 21)
- Hybrid Wall or Floor Mount Design: Flexible installation options with a durable,
space-saving enclosure (IP20 rated).
- High-Capacity Storage: 16kWh nominal energy and 314Ah capacity for
reliable, high-output performance.
- Auto-ID Technology: Automatically recognizes and syncs new batteries during
installation, simplifying system setup and configuration.
Battery Downloads
DOWNLOADBattery Specifications
Product Type:Low Voltage LFP Battery
Battery Type:Lithium Iron Phosphate (LFP)
Model Number:WM-48-314-IN-XX (XX is a number between 00 – 99)
Nominal Energy Capacity:16kWh
Usable Energy (DOD%):12.86kWh (80% recommended)
Voltage Range:47.5 – 57.6 VDC
Nominal Voltage:51.2 VDC
Capacity:314Ah
Charging Voltage Range:56 – 57 VDC
Discharging Cut-off Voltage:47.5 VDC
Max Continuous Charge Current:157A
Max Continuous Discharge Current:200A
Continuous Charge/Discharge Power:8/10.2 kW
Recommended Charging/Discharging Rate:0.5C
Peak Power:12.8kW (3 sec)
Round-trip Efficiency:95%
Max Parallel Units:16
Protection Features:Over/Under Voltage, Over-Current, Short Circuit, High/Low Temp
Battery Management System (BMS):Integrated, Active Balancing
Communication Protocols:RS485, CAN
Battery Breaker:250A
Storage Temperature Range**:-4 – 131°F (-20 – 55°C)
Humidity Range:5% – 95% RH (non-condensing)
Altitude:9843 ft. (<3000 m)
Cooling Method:Natural Convection
Dimensions (H × W × D):34.1 in. × 18.1 in. × 9.6 in. (865 mm × 460 mm × 245 mm)
Operating Temperature Range:Charge: 32 – 122°F (0 – 50°C); Discharging: -4 – 131°F (-20 – 55°C)
Recommended DOD Setting Note*:EG4 recommends this value be set no lower than 20% to maintain the recommended 80% Depth of Discharge.
Storage Temperature Note**:Less than 3 months of storage. If longer than 3 months, recommended storage temperature will be 59°F – 86°F (15°C – 30°C).
Weight:293.2 lbs. (133 kg)
Enclosure Rating:IP20
Mounting Options:Wall/Floor mount
Display/Indicators:LED Status
Connector Type:Degson quick connector/screw terminal
UL 1973:Yes
UL 9540A:Batt to Batt spacing of 6 in.
UN 38.3:Yes
FCC Part 15 (EMC):Yes
Protection Class:Class B
Cycle Life (70% EOL Capacity):10000 cycles @ 0.5C, 25°C, 80% DOD
Design Life*:10 years
Warranty:10 years or 10000 cycles
Application Type:Residential/Commercial/Off-grid/Backup
Lifetime Energy Throughput (Calculated):(51.2V×314Ah/1000×80%×10000/1000)90% = 115.7 MWh or (12861 kWh×10000 cycles×90% efficiency) = 115.7 MWh
Note:Information subject to change without notice.
Inverter Downloads
Inverter Specifications
Model:IV-16000-HYB-AW-FX-XX
CEC Model #:IV-16000-HYB-AW-FX-XX {240V} | IV-16000-HYB-AW-FX-XX {208V}
Type:Hybrid
Design Topology:High Frequency – Transformerless
Nominal Voltage:120/240 or 208 VAC
Frequency:50/60 Hz
Phase Support:1ø
Nominal Output Voltage:120/240 VAC; 120/208 VAC (L1/L2/N required)
Max. Continuous Output:66.7 A | 16 kW
Max. Continuous Output – Battery Only:50 A | 6 kW
Max. Continuous Output – With PV & Grid @25°C:66.7 A | 16 kW
Peak Power:24,000 W (0.5 s) | 18,000 W (1 s) | 15,000 W (6 min) | 13,200 W (12 min)
Locked Rotor Amps (LRA):195 A
Max. Continuous Output Per-Leg:50 A | 6 kW
Power Factor:0.99 @ Full Load
Max. Pass-Thru Current from Grid:90 A
Nominal Grid Voltage:120/240 VAC | 120/208 VAC (L1/L2/N required)
Max. Grid Input Power to Inverter (w/out Pass-Thru):50 A | 12 kW
Max. Grid Circuit Rating (w/ Pass-Thru):90 A
Nominal Voltage:51.2 VDC
Operating Voltage Range:40 – 60 VDC
Max. Charge Current (DC Amps):250 A DC
Max. Discharge Current (DC Amps):250 A DC
Battery Charge/Discharge Ripple Current:< 5%
# of MPPTs:3
Rated Current per MPPT:26 A (MPPT 1) | 26 A (MPPT 2) | 15 A (MPPT 3)
Inputs per MPPT:3 | 2 (MPPT 1) | 2 (MPPT 2) | 1 (MPPT 3)
Short-Circuit Current Rating per MPPT:31 A (MPPT 1) | 31 A (MPPT 2) | 19 A (MPPT 3)
Max. DC Input Voltage*:600 VDC
MPPT DC Startup Voltage:200 VDC
MPPT Full Power Voltage Range**:250 – 440 VDC
MPPT DC Operating Voltage Range:120 – 240 VDC
MPPT Voltage High Protection***:550 VDC
Recommended Max. Solar Array Power (STC):21 kW
Transfer Time (Grid to Battery Switching Time):20 ms (Default), 10 ms (Configurable)
Open Loop Response Time (OLRT):< 2 s
Time to Steady State:< 10 s
CEC Weighted Efficiency:97%
Max. Efficiency: PV to Grid/Load:97%
Max. Efficiency: Battery to Grid/Load:94%
Max. Efficiency: PV to Battery:94.5%
Max. Efficiency: AC to Battery:94%
Idle Consumption (Standby Mode):< 65 W @ 25 °C
Display:Optional EG4 FlexBOSS Screen Kit
User Interface:App / Web
Remote Connectivity:Wi-Fi, Cellular, and Ethernet (Wi-Fi dongle included by default)
Operating Temperature Range:-13° – 140°F (-25° – 60°C)
Storage Temperature Range:-13° – 140°F (-25° – 60°C)
Operating Humidity:0–95% relative humidity
Max. Altitude of Operation:< 6,561 ft (< 2,000 m)
Enclosure Rating:NEMA 4X
Cooling Method:Fans
Noise:< 50 dB @ 3 ft
Dimensions (H × W × D):30.43 × 22.28 × 11.22 in (773 × 566 × 285 mm)
Unit Weight:121 lbs (55 kg)
Mounting:Wall mount
Max # of Inverters in Parallel:16 units
Certifications:UL 1741, UL 1741 PCS CRD TEST, UL3141
EMC Compliance:FCC Part 15 Class B
Safety Class:Class I
Environmental Protection:RoHS Compliant
AC Input Breaker:90 A
AC Output Breaker:80 A
PV Input Breaker:32 A per MPPT
Battery Breaker:250 A DC
EG4 WallMount Indoor Battery: 10-Year EG4 Manufacturer Warranty
Introducing The EG4 WallMount Indoor Battery
Latest BMS Technology
Third-Generation BMS: Provides advanced monitoring, improved balancing precision, and faster response times for greater safety and system efficiency.
All-Weather Self-Heating
Self-Heating Function: Maintains optimal performance and battery health in cold environments.
Your Personal Power House
200A Continuous Output / 12.8kW Peak Power: Supports heavy household loads and seamless backup operation.
Show off your build!
Community sparks inspiration, if you’d like to take pride in presenting your set up, submit your build to us for a chance to be featured and win a BigBattery mystery gift. Enter your build here.
Key Features:
- Cross-Compatible with Other EG4 Models: Seamlessly integrates with existing
EG4 battery systems for flexible scaling and expanded storage capacity. (Note: UL9540 Certified only with Flexboss 18 & Flexboss 21)
- Hybrid Wall or Floor Mount Design: Flexible installation options with a durable,
space-saving enclosure (IP20 rated).
- High-Capacity Storage: 16kWh nominal energy and 314Ah capacity for
reliable, high-output performance.
- Auto-ID Technology: Automatically recognizes and syncs new batteries during
installation, simplifying system setup and configuration.
Battery Downloads
Battery Specifications
Product Type:Low Voltage LFP Battery
Battery Type:Lithium Iron Phosphate (LFP)
Model Number:WM-48-314-IN-XX (XX is a number between 00 – 99)
Nominal Energy Capacity:16kWh
Usable Energy (DOD%):12.86kWh (80% recommended)
Voltage Range:47.5 – 57.6 VDC
Nominal Voltage:51.2 VDC
Capacity:314Ah
Charging Voltage Range:56 – 57 VDC
Discharging Cut-off Voltage:47.5 VDC
Max Continuous Charge Current:157A
Max Continuous Discharge Current:200A
Continuous Charge/Discharge Power:8/10.2 kW
Recommended Charging/Discharging Rate:0.5C
Peak Power:12.8kW (3 sec)
Round-trip Efficiency:95%
Max Parallel Units:16
Protection Features:Over/Under Voltage, Over-Current, Short Circuit, High/Low Temp
Battery Management System (BMS):Integrated, Active Balancing
Communication Protocols:RS485, CAN
Battery Breaker:250A
Storage Temperature Range**:-4 – 131°F (-20 – 55°C)
Humidity Range:5% – 95% RH (non-condensing)
Altitude:9843 ft. (<3000 m)
Cooling Method:Natural Convection
Dimensions (H × W × D):34.1 in. × 18.1 in. × 9.6 in. (865 mm × 460 mm × 245 mm)
Operating Temperature Range:Charge: 32 – 122°F (0 – 50°C); Discharging: -4 – 131°F (-20 – 55°C)
Recommended DOD Setting Note*:EG4 recommends this value be set no lower than 20% to maintain the recommended 80% Depth of Discharge.
Storage Temperature Note**:Less than 3 months of storage. If longer than 3 months, recommended storage temperature will be 59°F – 86°F (15°C – 30°C).
Weight:293.2 lbs. (133 kg)
Enclosure Rating:IP20
Mounting Options:Wall/Floor mount
Display/Indicators:LED Status
Connector Type:Degson quick connector/screw terminal
UL 1973:Yes
UL 9540A:Batt to Batt spacing of 6 in.
UN 38.3:Yes
FCC Part 15 (EMC):Yes
Protection Class:Class B
Cycle Life (70% EOL Capacity):10000 cycles @ 0.5C, 25°C, 80% DOD
Design Life*:10 years
Warranty:10 years or 10000 cycles
Application Type:Residential/Commercial/Off-grid/Backup
Lifetime Energy Throughput (Calculated):(51.2V×314Ah/1000×80%×10000/1000)90% = 115.7 MWh or (12861 kWh×10000 cycles×90% efficiency) = 115.7 MWh
Note:Information subject to change without notice.
Inverter Downloads
Inverter Specifications
Model:IV-16000-HYB-AW-FX-XX
CEC Model #:IV-16000-HYB-AW-FX-XX {240V} | IV-16000-HYB-AW-FX-XX {208V}
Type:Hybrid
Design Topology:High Frequency – Transformerless
Nominal Voltage:120/240 or 208 VAC
Frequency:50/60 Hz
Phase Support:1ø
Nominal Output Voltage:120/240 VAC; 120/208 VAC (L1/L2/N required)
Max. Continuous Output:66.7 A | 16 kW
Max. Continuous Output – Battery Only:50 A | 6 kW
Max. Continuous Output – With PV & Grid @25°C:66.7 A | 16 kW
Peak Power:24,000 W (0.5 s) | 18,000 W (1 s) | 15,000 W (6 min) | 13,200 W (12 min)
Locked Rotor Amps (LRA):195 A
Max. Continuous Output Per-Leg:50 A | 6 kW
Power Factor:0.99 @ Full Load
Max. Pass-Thru Current from Grid:90 A
Nominal Grid Voltage:120/240 VAC | 120/208 VAC (L1/L2/N required)
Max. Grid Input Power to Inverter (w/out Pass-Thru):50 A | 12 kW
Max. Grid Circuit Rating (w/ Pass-Thru):90 A
Nominal Voltage:51.2 VDC
Operating Voltage Range:40 – 60 VDC
Max. Charge Current (DC Amps):250 A DC
Max. Discharge Current (DC Amps):250 A DC
Battery Charge/Discharge Ripple Current:< 5%
# of MPPTs:3
Rated Current per MPPT:26 A (MPPT 1) | 26 A (MPPT 2) | 15 A (MPPT 3)
Inputs per MPPT:3 | 2 (MPPT 1) | 2 (MPPT 2) | 1 (MPPT 3)
Short-Circuit Current Rating per MPPT:31 A (MPPT 1) | 31 A (MPPT 2) | 19 A (MPPT 3)
Max. DC Input Voltage*:600 VDC
MPPT DC Startup Voltage:200 VDC
MPPT Full Power Voltage Range**:250 – 440 VDC
MPPT DC Operating Voltage Range:120 – 240 VDC
MPPT Voltage High Protection***:550 VDC
Recommended Max. Solar Array Power (STC):21 kW
Transfer Time (Grid to Battery Switching Time):20 ms (Default), 10 ms (Configurable)
Open Loop Response Time (OLRT):< 2 s
Time to Steady State:< 10 s
CEC Weighted Efficiency:97%
Max. Efficiency: PV to Grid/Load:97%
Max. Efficiency: Battery to Grid/Load:94%
Max. Efficiency: PV to Battery:94.5%
Max. Efficiency: AC to Battery:94%
Idle Consumption (Standby Mode):< 65 W @ 25 °C
Display:Optional EG4 FlexBOSS Screen Kit
User Interface:App / Web
Remote Connectivity:Wi-Fi, Cellular, and Ethernet (Wi-Fi dongle included by default)
Operating Temperature Range:-13° – 140°F (-25° – 60°C)
Storage Temperature Range:-13° – 140°F (-25° – 60°C)
Operating Humidity:0–95% relative humidity
Max. Altitude of Operation:< 6,561 ft (< 2,000 m)
Enclosure Rating:NEMA 4X
Cooling Method:Fans
Noise:< 50 dB @ 3 ft
Dimensions (H × W × D):30.43 × 22.28 × 11.22 in (773 × 566 × 285 mm)
Unit Weight:121 lbs (55 kg)
Mounting:Wall mount
Max # of Inverters in Parallel:16 units
Certifications:UL 1741, UL 1741 PCS CRD TEST, UL3141
EMC Compliance:FCC Part 15 Class B
Safety Class:Class I
Environmental Protection:RoHS Compliant
AC Input Breaker:90 A
AC Output Breaker:80 A
PV Input Breaker:32 A per MPPT
Battery Breaker:250 A DC
EG4 WallMount Indoor Battery: 10-Year EG4 Manufacturer Warranty
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